pH Calculator
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Example pH Calculator Calculation
Example 1:Use pH Calculator to calculate pH and
H3O+-conc.
in a 0.1M solution of acetic acid(Ka=1.75E-5).
Solution - pH Calculator Calculation:
1) Insert equation of dissociation: CH3COOH + H2O > CH3COO- + H3O+
2) Insert 1.75E-5 in K-field
3) Insert 0.1 in CH3COOH (Before dissoc.)-field
4) Calculate
Example 2: Decide the amount of undissociated acetic
acid in a [H3O+] =
0.002M solution (Ka=1.75E-5)
.
Solution - pH Calculator Calculation:
1) Insert equation of dissociation: CH3COOH + H2O > CH3COO- + H3O+
2) Insert 1.75E-5 in K-field
3) Insert 0.002 in H3O+/OH--field
4) Calculate
Example 3:Decide conc. of dissoc. and undissoc. acetic acid
in a pH=4 solution (Ka=1.75E-5)
Solution - pH Calculator Calculation:
1) Insert equation of dissociation: CH3COOH + H2O > CH3COO- + H3O+
2) Insert 1.75E-5 in K-field
3) Insert 4 i pH-field
4) Calculate
Example 4:Find pH in a solution containing 0.1M
CH3COONa and 0.1M acetic acid(Ka=1.75E-5)
Calaculation - pH Calculator Solution:
1) Insert equation of dissociation: CH3COOH + H2O > CH3COO- + H3O+
2) Insert 1.75E-5 in K-field
3) Insert 0.1 in CH3COOH (Before dissoc.)-field
4) Insert 0.1 in CH3COO- common ion field
5) Calculate.
Example 5:a)How many moles of NaAc (CH3COONa) must be
added in a 1 dm3 0.001M CH3COOH-solution
making a pH=7.0-buffer
(Ka=1.75E-5).
Calculation pH Calculator - Solution:
1) Insert equation of dissociation: CH3COOH + H2O > CH3COO- + H3O+
2) Insert 1.75E-5 in K-field
3) Insert 0.001 in CH3COOH (Before dissoc.)-field
4) Insert 7.0 pH-field
5) Calculate
Example 6:How many moles of NaCN must be added in a
1 dm3 0.2M HCN before [H3O+] = 1.0E-6 ?
(Ka=5.85E-10)
Calculation - pH Calculator Solution:
1) Insert equation of dissociation: HCN + H2O > CN- + H3O+
2) Insert 5.85E-10 in K-field
3) Insert 1E-6 in H3O+-field
4) Insert 0.2 i HCN (before dissoc.) field.
5) Calculate